http://en.wikipedia.org/wiki/Hmong_peopleLaos
The "Secret War"
Main article: Laotian Civil War
In the early 1960s, the U.S. Central Intelligence Agency's (CIA) Special Activities Division began to recruit, train and lead the indigenous Hmong people in Laos to join fighting the Vietnam War, named as a Special Guerrilla Unit led by General Vang Pao. About 60% of the Hmong men in Laos were supported by the CIA to join fighting for the "Secret War" in Laos.<27> <28> The CIA used the Special Guerrilla Unit as the counter attack unit to block the Ho Chi Minh Trail, the main military supply route from the north to the south. Hmong soldiers put their lives at risk in the frontline fighting for the United States to block the supply line and to rescue downed American pilots. In 1967-1971, 3,772 Hmong soldiers were killed in the frontline, 5,426 were injured and disabled.<29> In 1962-1975, about 12,000 Hmong died fighting against Pathet Lao.<30>
General Vang Pao led the Region II (MR2) defense against NVA incursion from his headquarters in Long Cheng, also known as Lima Site 20 Alternate (LS 20A).<31> At the height of its activity, Long Cheng became the second largest city in Laos. Long Cheng was a micro-nation operational site with its own bank, airport, school system, officials, and many other facilities and services in addition to its military units. Before the end of the Secret War, Long Cheng would fall in and out of General Vang Pao's control.
The Secret War began around the time that the U.S. became officially involved in the Vietnam War. Following the U.S. withdrawal from Vietnam in 1975, the Lao kingdom was overthrown by the communists and the Hmong people became targets of retaliation and persecution. While some Hmong people returned to their villages and attempted to resume life under the new regime, thousands more made the trek to and across the Mekong River into Thailand, often under attack. This marked the beginning of a mass exodus of Hmong people from Laos. Those who did make it to Thailand generally were held in squalid United Nations refugee camps. Nearly 20 years later, in the 1990s, a major international debate ensued over whether the Hmong should be returned to Laos, where opponents of their return argued they were being subjected to persecution, or afforded the right to emigrate to the U.S. and other Western nations.
Hmong Lao resistance
Of those Hmong who did not flee Laos, somewhere between two and three thousand were sent to re-education camps where political prisoners served terms of 3-5 years. Many Hmong died in these camps, after being subjected to hard physical labor and harsh conditions.<32> Thousands more Hmong people, mainly former soldiers and their families, escaped to remote mountain regions - particularly Phou Bia, the highest (and thus least accessible) mountain peak in Laos. Initially, some Hmong groups staged attacks against Pathet Lao and Vietnamese troops while others remained in hiding to avoid military retaliation and persecution. Spiritual leader Zong Zoua Her rallied his followers in a guerrilla resistance movement called Chao Fa (RPA: Cauj Fab). Initial military successes by these small bands led to military counter-attacks by government forces, including aerial bombing and heavy artillery, as well as the use of defoliants and chemical weapons.<33>
Small groups of Hmong people, many of them second or third generation descendants of former CIA soldiers, remain internally displaced in remote parts of Laos, in fear of government reprisals. Faced with continuing military operations against them by the government and a scarcity of food, some groups have begun coming out of hiding, while others have sought asylum in Thailand and other countries.<34>
Throughout the Vietnam War, and for two decades following it, the U.S. government stated that there was no "Secret War" in Laos and that the U.S. was not engaged in air or ground combat operations in Laos. In the late 1990s, however, several U.S. conservatives, alleging that the Clinton administration was using the denial of this covert war to justify a repatriation of Thailand-based Hmong war veterans to Laos, urged the U.S. government to acknowledge the existence of the Secret War and to honor the Hmong and U.S. veterans from the war. On May 15, 1997, in a total reversal of U.S. policy, the U.S. government acknowledged that it had supported a prolonged air and ground campaign against the NVA and VietCong. It simultaneously dedicated the Laos Memorial on the grounds of Arlington National Cemetery in honor of the Hmong and other combat veterans from the Secret War.